You should be able to power all this with your psu you already have and use the same case. This build turned out to be $899.95 on newegg. There might be a little room for another video card or if you need a HD.

Is that ram compatible with the mobo? I know it will phisically fit but I'm not sure if that mobo is rated for DDR3 2133 PC3 17000. I could be wrong though.